https://sacramento.cbslocal.com/2020...ir-force-base/ has a take on who pays.
An American living in China returned to the US with his daughter and they were in quarantine for some time. The bill came to the house of the guy’s mother and it amounts to something like $3500-5500. It’s not being covered by insurance from his employer in China. The majority of the cost was from an ambulance service.